public class ThreadDemo5 {
    public static void main(String[] args) throws InterruptedException {
        Thread thread = new Thread(()->{
           while (true){
               System.out.println("hello!");
               try {
                   Thread.sleep(1000);
               } catch (InterruptedException e) {
                   e.printStackTrace();
               }
           }
        });
        thread.start();
        while (true){
            System.out.println("main");
            Thread.sleep(1000);

        }
    }
}
